GRB 250129A¶

Photometry and validation¶

Team:

Prompt¶

X-ray¶

Analysis: Dahlia, Thomas Hussenot, Mona (GRANDMA)
Review: Magui (UNAM/Colibri)
Status: up to 21.05.2024

Lightcurve points have been finalized:

• Points are binned with non-continous, manually defined time indices to group specific points in clusters with the purpose of decreasing uncertainty and acquiring a smoother cadence.
• Lightcurve provided at 10keV and 2keV Flux density (uJy) and AB magnitudes.

Review by Magui:

• Curve consistent with Swift XRT
• Explain further in the text the specifics of the contiguous segments "If a unique time bin cannot be defined, better to specify each time bin used".

Status of the text:
Text of explaining the lightcurve has been completed. Will adjust the sentence about the binning method to better describe the specific indices used.

Text for the spectral fitting has been written preliminarily, covering only the analysis done on the three sources within T-T0 = 1 day. The fitting was done for the photon index and normalization factor, where the phoron index was compatible within errors between the sources and relatively unchanging. Based on comments by Antonio and Tanomy, the photon index will no longer be varied, and we will test for any evolution during the flare or decline phase.

UV¶

Analysis: Mona (GRANDMA) and Sam (Swift)
Review: Sarah
Status: up to 20.05.2024
The analysis of the UV data has been independently conducted by Mona Molham (GRANDMA side) and Sam Oates (SWIFT side, expert recommended by Phil Evans and Antonio de Ugarte Postigo). Sam Oates provided a detailed dataset that included individual data points, with detections and upper limits. In her method, a detection can include measures with errors that correspond to an SNR up to 1.

Mona and Dahlia correspond with Sam, and Mona follows Sam's method, in addition to stacking the data.

Results from both analysts were uploaded to Skyportal: Sam’s independently, and Mona’s on May 1st and May 19th. The results were then reviewed by Sarah Antier.

Sarah's review process involved two main checks:

a) Cross-validation of Analyses: She assessed the consistency between Mona’s and Sam’s datasets, primarily by ensuring the compatibility of their error bars.

b) Cross-check with Optical Data: She examined whether any significant features (e.g., bumps in the light curve) seen in the UV also appeared in the optical bands.

As part of her quality control, Sarah excluded all points with an SNR below 3. She requested Mona to re-stack them to potentially raise the SNR above this threshold when the data could be grouped/clustered appropriately by time, while not sacrificing time resolution in the log-scale. We are currently awaiting Mona’s re-analysis of the data that covers the UV filters: UV white, B, UVW1, UVW2, UVM1, and UVM2.

A draft text summarizing the UVW1 data was written by Mona under the instructions of Dahlia. This draft is pending final review and validation.

Optical¶

Analysis: Dahlia, Sergey (GRANDMA) with help of Francesco for Colibri
Review: Sarah
Status: up to 20.05.2024

The Review was performed by Sarah and you can find all the status in the dedicated page.
Missing R-band, C2PU data and J band currently
The text needs to be reviewed as well

Review photometry

Extinction¶

Analysis: Dahlia
Reviewer: M. Pillas

• GRB coordinates: correct
• Code: correct
• Reproduction of the results: done
• diff MWcorrected_GRB250129A_review.csv MWcorrected_GRB250129A.csv showed no difference.

The extinction correction has been checked and is validated.

Review on the article